﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class cfx:Father 
    {
        public double c;
        public double k;
        public override void jisuan()
        {
            base.jisuan();
            Console.WriteLine("长方形的面积为："+(c*k));
        }
    }
}
